On Thu, Sep 19, 2013 at 1:47 PM, Josh Berkus <josh@xxxxxxxxxxxx> wrote: > 4. n-distinct will still be listed as -1 (unique) for the column. > > Why? Because of this: https://github.com/postgres/postgres/blob/master/src/backend/utils/adt/rangetypes_typanalyze.c#L205 We only collect and use histograms of lower and upper bounds for range types, and the fraction of empty ranges. -- Regards, Peter Geoghegan -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
